期刊
NATURE COMMUNICATIONS
卷 8, 期 -, 页码 -出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/ncomms14091
关键词
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资金
- Natural Science Foundation of China [U1032003, 31371404, 31571429]
- Natural Science Foundation of Guangdong [2015A030311041]
- Russian Science Foundation [14-50-00060]
- Shenzhen Science and Technology Innovation Committee [JCYJ20130402145002397, JCYJ20140417115840279, GJHZ20150316160614842]
- Russian Science Foundation [14-50-00060] Funding Source: Russian Science Foundation
Skin stem cells can regenerate epidermal appendages; however, hair follicles (HF) lost as a result of injury are barely regenerated. Here we show that macrophages in wounds activate HF stem cells, leading to telogen-anagen transition (TAT) around the wound and de novo HF regeneration, mostly through TNF signalling. Both TNF knockout and overexpression attenuate HF neogenesis in wounds, suggesting dose-dependent induction of HF neogenesis by TNF, which is consistent with TNF-induced AKT signalling in epidermal stem cells in vitro. TNF-induced beta-catenin accumulation is dependent on AKT but not Wnt signalling. Inhibition of PI3K/AKT blocks depilation-induced HF TAT. Notably, Pten loss in Lgr5(+) HF stem cells results in HF TAT independent of injury and promotes HF neogenesis after wounding. Thus, our results suggest that macrophage-TNF-induced AKT/beta-catenin signalling in Lgr5(+) HF stem cells has a crucial role in promoting HF cycling and neogenesis after wounding.
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